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Image copyright Getty Images Concrete is the most widely used man-made material in existence. It is second only to water as the most-consumed resource on the planet. But, while cement – the key ingredient in concrete – has shaped much of our built environment, it also has a massive carbon footprint. Cement is the source […]

Image copyright YASUYOSHI CHIBAImage caption UN Environment executive director Erik Solheim The head of the UN body that leads on sustainability and green issues has been criticised for extensive and expensive air travel. A draft internal audit, obtained by the Guardian and seen by the BBC, says that Erik Solheim’s actions risked the reputation of […]

Media playback is unsupported on your device Media captionBrazil’s mining dams: A disaster waiting to happen? The catastrophic collapse of a dam at a mine in Brazil has exposed a darker side of an industry that the world depends on. At nearly 800 sites across the country and thousands more around the world, dams contain […]